EP0601287A2 - Vorrichtung zur Reinigung von Abgasen einer Dieselbrennkraftmaschine - Google Patents

Vorrichtung zur Reinigung von Abgasen einer Dieselbrennkraftmaschine Download PDF

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Publication number
EP0601287A2
EP0601287A2 EP93114483A EP93114483A EP0601287A2 EP 0601287 A2 EP0601287 A2 EP 0601287A2 EP 93114483 A EP93114483 A EP 93114483A EP 93114483 A EP93114483 A EP 93114483A EP 0601287 A2 EP0601287 A2 EP 0601287A2
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EP
European Patent Office
Prior art keywords
filter
exhaust gas
valve
pipe
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93114483A
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English (en)
French (fr)
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EP0601287B1 (de
EP0601287A3 (en
Inventor
Kimimichi Tokuda
Kouichi Watanabe
Junichi Onoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0601287A2 publication Critical patent/EP0601287A2/de
Publication of EP0601287A3 publication Critical patent/EP0601287A3/en
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Publication of EP0601287B1 publication Critical patent/EP0601287B1/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/031—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters having means for by-passing filters, e.g. when clogged or during cold engine start
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/031—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters having means for by-passing filters, e.g. when clogged or during cold engine start
    • F01N3/032—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters having means for by-passing filters, e.g. when clogged or during cold engine start during filter regeneration only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2270/00—Mixing air with exhaust gases
    • F01N2270/04—Mixing air with exhaust gases for afterburning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/30—Exhaust treatment

Definitions

  • the present invention relates to apparatus for purifying exhaust gas such that particulate matter material such as soot in the exhaust gas of an internal combustion engine such as a diesel engine is trapped by a filter.
  • Fig. 12 shows the prior apparatus for purifying exhaust gas.
  • the exhaust gas from a diesel engine 81 is first muffled by a muffler 82 and then purified by a filter 83.
  • the filtering function of filter 83 is reduced after its use for a certain time period, during which carbon or soot components adhere to the filter. Therefore, in the prior apparatus, an exhaust pressure sensor 84 detects the malfunction of a filter.
  • an controller ECU closes a valve 85 and opens a valve 86 to discharge the exhaust gas through a by-pass pipe 87, while heating up filter 83 by an electric heater 88 installed in the filter to burn up carbon components trapped in filter 83 and to reactivate the filter.
  • the filter is made of ceramic material.
  • Table 1 shows characteristics of main ceramic materials used for exhaust gas filters, and Fig. 2 shows characteristics of typical particulate filters.
  • Table 1 Ceramic Materials Melting point (°C) Maximum working temperature (°C) Thermal expansion coefficient (x10 ⁇ 6/°C) Silica (SiO2) 1730 900 0.5 Cordierite (2MgO ⁇ 2Al2O3 ⁇ 6SiO2) 1465 1000 1.5 Mullite (3Al2O3 ⁇ 2SiO2 ) 1840 1200 5.0 Alumina (Al2O3) 2045 1500 8.8 Zirconia (ZrO2) 2580 1600 10.0
  • Table 2 Fiber ceramic Ceramic honeycomb Ceramic foam Wire mesh Composition Mullite Cordierite Cordierite Stainless Steel Volume density (g/c ml) 0.3 ⁇ 0.4 1.6 ⁇ 1.8 0.3 ⁇ 0.4 ---- Vacancy rate (%) 85 ⁇ 92 35 ⁇ 50 84 ⁇ 88 90 ⁇ 98 Maximum working temperature(°C) 1200 1000 1000 1000 1000
  • Fig. 13 shows time/temperature characteristics inside a filter when the prior engine switches the valves during its work at a high load to force the exhaust gas to flow into the filter.
  • each line shows each of outputs of plural temperature sensors arranged at various positions in the filter.
  • the internal temperature of the filter rises upto 500 °C or more within 30 seconds or so and this rapid temperature rise causes cracks in the ceramic material used for the filter. In fact, many cracks were observed in the filter when inspected after the experiment.
  • An object of the present invention is therefore to prevent the cracking of a ceramic filter due to a rapid change of temperature and to provide an apparatus for purifying exhaust gas that properly functions as an exhaust gas filter.
  • an apparatus for cleaning exhaust gas in accordance with the present invention comprises a filter that impacts and absorbs carbon components in the exhaust gas from an engine and burns up the adhering carbon components after a certain amount of them is deposited to activate the filter itself, a first pipe that leads the exhaust gas from the engine into the filter, a second pipe that leads the exhaust gas cleaned by the filter into a muffler, a by-pass pipe that branches off from the first pipe and is connected to the second pipe to by-pass the exhaust gas from the first pipe into the second pipe, a first valve that is installed inside the first pipe and controls the flow of exhaust gas into the filter, a second valve that is installed inside the by-pass pipe and controls the flow of exhaust gas in the by-pass pipe, a first temperature detector that detects the temperature of exhaust gas in the first pipe, a second temperature detector that detects the temperature of the filter, a heating system that heats up the filter, and a controller that controls the heating system, the first valve, and the second valve based on the output
  • an apparatus of cleaning exhaust gas such that the detection of the temperatures is omitted, and the controller controls the opening and closing of the valves based on the lapse of time after the starting of the engine or based on a preprogrammed routine. For example, the controller closes the first valve and opens the second valve, when the engine has started, or the exhaust gas has not flowed into the filter for a certain time period (the temperature of the filter has declined).
  • the present invention controls the first and second valves by detecting the temperatures of the exhaust gas and the ceramic filter with temperature detectors or by considering a rapid change of temperature immediately after the starting of the engine in order not give a rapid change of temperature to the filter, so that cracking of the ceramic filter is prevented.
  • Fig. 1 shows a block diagram of the first embodiment in accordance with the present invention.
  • reference numeral 1 denotes an engine
  • 2 denotes a first pipe for leading the exhaust gas of the engine into a filter
  • 3 denotes a filter that cleans exhaust gas by impacting particulate matter of carbon components and others in exhaust gas
  • 4 denotes a second pipe that leads exhaust gas discharged from filter 3 into a muffler 5, which reduces exhaust sound.
  • 6 denotes a by-pass pipe that connects first pipe 2 and second pipe 4 to lead exhaust gas into muffler 5 bypassing filter 3
  • 7 denotes a controller that controls valves 8, 9, a heating system 17, a blower 18 and others based on the outputs of engine 1, temperature detectors 13, 14, and pressure sensors 15, 16.
  • Controller 7 comprises a CPU and memory.
  • 8 denotes a valve installed inside first pipe 1 and controls the flow of exhaust gas into filter 3.
  • the present embodiment uses a valve such that a disk is rotated to control the flow in a pipe.
  • 9 denotes a valve of the same type and controls the flow in by-pass pipe 6.
  • 10 and 11 denote actuator that respectively actuate valves 8 and 9, and the present embodiment uses a stepping motor to control them open loop.
  • FIG. 12 denotes a battery that stores energy for burning up carbon components captured and deposited in filter 3, and the present embodiment uses type 24V300Ah.
  • Battery 12 is charged by a dynamo, and its switch 12 is set to turn ON by controller 7 to provide an electric current to heating system 17 to burn up carbon components deposited in filter 3.
  • 13 and 14 denote temperature detectors that detect the temperature T1 of exhaust gas in pipe 2 and the temperature T2 of filter 3, and the present invention uses thermo-couples.
  • Temperature detector 14 may be installed in the rear of filter 3.
  • 15 and 16 denote pressure sensors that detect the pressures P1 and P2 of exhaust gas in the pipes, and the present embodiment uses pressure sensors comprising semiconductors.
  • 18 denotes a blower that blows air into filter 3 to prompt the burnup of carbon components in filter 3.
  • Fig. 2 shows a partially cut perspective view of filter 3 used in the present embodiment.
  • the material of filter 3 is mullite (3Al2O3 ⁇ 2SiO2), and the structure of the filter is fiber.
  • Step 301 initializes temperature detectors 13, 14, pressure sensors 15, 16, valves 8, 9, and others.
  • Valve 8 is initialised to the open state, and valve 9 is initialized to the closed state.
  • Step 302 detects the temperature T1 of the exhaust gas and the temperature T2 of filter 3.
  • Step 303 compares the detected temperatures T1 and T2, and if the difference between T1 and T2 is greater than or equal to a constant, then the operation goes to Step 313; otherwise, the operation goes to 304.
  • the constant is set to 300 °C in the present embodiment.
  • Step 303 judges that the difference between T1 and T2 is greater than or equal to 300 °C, then Step 313 opens valve 8 by 20% and opens valve 9 by 80% to prevent hot exhaust gas from rapidly flowing into filter 3, while sending a small quantity of exhaust gas into filter 3 to gradually increase the temperature of filter 3. Then the operation returns to Step 302 to detect the temperatures T1 and T2 again. If Step 303 judges that the difference between T1 and T2 is less than 300 °C, then Step 304 judges if the difference is greater than or equal to 250 °C.
  • Step 314 opens valve 8 by 70% and opens valve 9 by 30%, so that more exhaust gas flows into filter 3, and the temperature of the filter increases.
  • Step 305, 306, and 307 classifies the temperature difference between T1 and T2, and the opening of the valves are performed depending on the classified cases and based on previously calculated results. Specifically, as shown in Fig. 3, if the temperature difference is 200 °C ⁇ 250 °C, Step 315 opens valve 8 by 50% and valve 9 by 50%. If the temperature difference is 150 °C ⁇ 200 °C, then Step 306 opens valve 8 by 70% and valve 9 by 30%.
  • Step 307 opens valve 8 by 80% and valve 9 by 20%. If the temperature difference is less than 100 °C, then Step 308 opens valve 8 by 100% and closes valve 9. In this way, by preventing a great amount of exhaust gas of high temperature from rapidly flowing into filter 3 and by gradually increasing the temperature of filter 3, the present embodiment prevents cracking of filter 3.
  • Fig. 4 shows how the temperature of filter 3 increases after the starting of the engine, when an apparatus of the present embodiment is used. As seen from Fig. 4, the temperature of filter 3 increases with a smaller temperature gradient than a conventional apparatus.
  • the apparatus does not perform the above operation. However, if the temperature difference between filter 3 and the exhaust gas becomes exceedingly high by some causes, then the above operation is performed to prevent cracking of filter 3. For example, if the driver wants to travel at the maximum power of the engine, he may close valve 8 and open valve 9 not to use filter 3. Further, if only urban areas are exhaust-gas regulated, then the driver may use filter 3 only when traveling in an urban area and may travel on roads outside urban areas without using filter 3. In these cases, filter 3 is cooled to become a normal temperature, so that the operation should be applied to prevent cracking of filter 3.
  • Step 309 measures and detects the pressures P1, P2 of the exhaust gas in the first pipe and the second pipe by pressure sensors 15, 16.
  • Step 310 compares the detected pressures P1 and P2. If the difference between P1 and P2 is greater than a constant, then filter 3 is judged to be stuffed and malfunctioning, and the operation goes to Step 311. Since the present embodiment uses a cylindrical filter 5. 66 inches in diameter and 6.00 inches long, the carbon components deposited in filter 3 are burned up, when the pressure difference between P1 and P2 reaches 1000 mmAq. The predetermined constant for the pressure difference depends on the shape and material of filter 3. Step 311 heats up filter 3 by heating system 16 and blows air in by blower 17, so that the deposited soot or the like is burned up and filter 3 is made cleanly reactivated.
  • Fig. 5 shows a flowchart of the burnup operation of carbon components. Since this operation is the same as a prior one, its description is omitted. Although no indicated in the flowchart, catalysts may be used to lower the combustion temperature as in a prior operation. After carbon components are burned up by Step 31, the operation of the apparatus for cleaning exhaust gas of the present embodiment returns to Step 302 and repeats the same routine described above.
  • the present embodiment detects the temperature of exhaust gas flowing into filter 3, and if the detected temperature is greatly different from the temperature of filter 3, then valves 8 and 9 are controlled so that too large quantity of exhaust gas of high temperature is not impacted against filter 3. As a result, cracking of filter 3 due to a rapid temperature change can be prevented.
  • Fig. 6 shows a block diagram of the present embodiment.
  • a component similar to one in the first embodiment has the same number.
  • the second embodiment is different from the first embodiment in that temperature detectors 13 and 14 are omitted.
  • the present embodiment simplifies and improves the first embodiment.
  • the reason for omitting temperature detectors are as follows. A change of temperature that destroys filter 3 occurs, when exhaust gas of high temperature flows into cool filter 3 immediately after the engine is started or after driving without using filter 3. Therefore, The same effects as those of the first embodiments are obtained if a similar operation of gradually giving exhaust gas to filter 3 as in the first embodiment is performed immediately after the starting of the engine or after a period of not using filter 3.
  • the present embodiment performs an initial operation of the apparatus for purifying exhaust gas, if controller 7 detects the starting of engine 1.
  • composition of the present embodiment is omitted, since it is almost the same as that of the first embodiment.
  • Fig. 7 shows a flowchart of the operation of the present embodiment.
  • Step 700 if the engine starts, this exhaust gas purifying routine starts (Step 700).
  • Step 701 sets initial values and initializes valves 8, 9 and pressure sensors 15, 16.
  • Steps 703 to 708 performs an initial operation by controlling valves 8 and 9. Specifically, Step 703 opens valve 8 by 20% and valve 9 by 80%. This state of valves 8, 9 lasts 5 seconds. This time period of 5 seconds can be counted using the clock frequency of the CPU.
  • Step 704 opens valve 8 by 30% and valve 9 by 70%.
  • Step 705 opens valve 8 by 50% and valve 9 by 30%
  • Step 706 opens valve 8 by 70% and valve 9 by 30%
  • Step 707 opens valve 8 by 80% and valve 9 by 20%
  • Step 708 opens valve 8 by 100% and closes valve 9.
  • the present embodiment assigns a time period of 5 seconds to each of Steps 703 to 708.
  • Steps 701 to 708 are the initial operation, by which a rapid change of temperature and cracking of filter 3 are prevented.
  • the operation proceeds with Steps 709, 710, 711, which are the same as Steps 309, 310, 311 of the first embodiment so that their description is omitted here. How the temperature of filter 3 increases when the above initial operation is performed is almost the same as the temperature change in the first embodiment shown in Fig. 4.
  • controller 7 holds information on the rates and duration of the openings of valves 8, 9, so that the above operation is performed to prevent cracking of filter 3, if the time during which valve 8 is closed has become more than a predetermined period, for example, 2 minutes.
  • the present embodiment controls valves 8, 9 not to give a rapid change of temperature to filter 3 by performing the initial operation depending on the time passing after the starting of the engine without using temperature detectors. Therefore, exhaust gas of high temperature does not rushing into filter 3, so that cracking of filter 3 can be prevented.
  • valves 8 and 9 are performed stepwise in both the first and the second embodiments. However, this control may be performed continuously.
  • the present embodiment also digitize the outputs of all the sensors, and controller 7 is programmed using a CPU and memory. However, the operation of controller can be realized by analog circuits.
  • Fig. 8 shows a third embodiment of the present invention.
  • the present embodiment provides one more filter 3' on the way of bypass pipe 6.
  • two filters 3 and 3' are arranged in parallel to each other between engine 1 and muffler 5.
  • Fig. 9 is a flowchart of exhaust gas purifying routine in the third preferred embodiment. As is apparent from comparison of Fig. 9 with Fig. 7, steps from 900 to 911 correspond to steps 700 to 711 of Fig. 7. Only differences are that valve 9 is replaced to valve 8' in Fig. 9 and rates of opening and closing of valves 8 and 8' are differentiated from those in the second preferred embodiment.
  • this routine starts in response to the engine start, valves 8 and 8' are opened by 50% for first five seconds, respectively (Step 902). From 5 to 10 second, valves 8 and 8' are opened by 60% and 40%, respectively (Step 903).
  • valve 8 is increased by 10% for every five seconds and that of valve 8' is decreased by 10% for every five seconds (Steps 904 to 907).
  • valve 8 is opened fully and valve 8' is closed completely.
  • all exhaust gas can be purified even during the engine start.
  • filter 3' may be identical to filter 3.
  • filters 3 and 3' are useable as the main filter alternatively.
  • Fig. 10 shows a fourth embodiment of the present invention wherein there are provided two filters 3 and 3' arranged in parallel to each other and a bypass pipe 6 without any filter.
  • Fig. 11 shows a flowchart of exhaust gas purifying routine by the fourth embodiment.
  • Steps 1100 to 1110 of Fig. 11 correspond to Steps 900 to 910 of Fig. 9 one to one.
  • the opening rate of valve 8 is increased 20% ⁇ 30% ⁇ 40% ⁇ 60% ⁇ 80% ⁇ 100% for every five seconds. That of valve 8' is increased first 20% ⁇ 30% ⁇ 40% until 15 seconds and, then, decreased 40% ⁇ 20% ⁇ 0% for remaining 15 seconds.
  • Valve 9 is opened by 60% for first five seconds and, thereafter, is gradually closed 40% ⁇ 20% ⁇ 0% and, after 20 seconds elapsed, it is closed completely.
  • amount of unpurified exhaust gas can be minimized when compared with the first and second preferred embodiments.
  • the third and fourth embodiments are directed to the exhaust gas purifying during the engine start, they are applicable to the thermal control of filter as mentioned regarding the first preferred embodiment of the present invention.
  • the present invention prevents a rapid change of temperature and cracking of the exhaust gas filter, so that durable apparatus for cleaning exhaust gas can be provided.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)
EP93114483A 1992-09-09 1993-09-09 Vorrichtung zur Reinigung von Abgasen einer Dieselbrennkraftmaschine Expired - Lifetime EP0601287B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4240316A JP2894103B2 (ja) 1992-09-09 1992-09-09 排気ガス浄化装置
JP240316/92 1992-09-09

Publications (3)

Publication Number Publication Date
EP0601287A2 true EP0601287A2 (de) 1994-06-15
EP0601287A3 EP0601287A3 (en) 1994-08-17
EP0601287B1 EP0601287B1 (de) 1998-08-19

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EP93114483A Expired - Lifetime EP0601287B1 (de) 1992-09-09 1993-09-09 Vorrichtung zur Reinigung von Abgasen einer Dieselbrennkraftmaschine

Country Status (4)

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US (1) US5489319A (de)
EP (1) EP0601287B1 (de)
JP (1) JP2894103B2 (de)
DE (1) DE69320445T2 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0891806A2 (de) * 1997-07-19 1999-01-20 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zur Regeneration einer Schwefelfalle
EP0892158A3 (de) * 1997-07-19 1999-04-21 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zur Überwachung der De-Sulfatierung bei NOx-Speicherkatalysatoren
EP1270885A3 (de) * 2001-06-20 2004-12-15 Isuzu Motors Limited Vorrichtung zur Abgasreinigung eines Dieselmotors
EP1882831A1 (de) * 2006-07-25 2008-01-30 Mann+Hummel Gmbh Abgasanlage eines Dieselmotors
EP2137388A1 (de) * 2007-04-16 2009-12-30 Volvo Lastvagnar AB Vorrichtung zur verwendung in einem abgasnachbehandlungssystem
US7640729B2 (en) 2004-09-25 2010-01-05 Robert Bosch Gmbh Method for operating a particulate filter situated in the exhaust gas area of an internal combustion engine and device for carrying out the method
EP1914399B1 (de) * 2006-10-17 2010-03-10 Ibiden Co., Ltd. Abgasreinigungsvorrichtung
GB2467949A (en) * 2009-02-20 2010-08-25 Clive Robert Rich Apparatus for improving the operation of a particulate filter by heating
US8127592B2 (en) * 2006-10-17 2012-03-06 Ibiden Co., Ltd. Particulate matter detection sensor

Families Citing this family (56)

* Cited by examiner, † Cited by third party
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US5489319A (en) 1996-02-06
DE69320445T2 (de) 1999-02-18
EP0601287B1 (de) 1998-08-19
JP2894103B2 (ja) 1999-05-24
JPH0693828A (ja) 1994-04-05
EP0601287A3 (en) 1994-08-17
DE69320445D1 (de) 1998-09-24

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